Y'know what a caltrop is? They work. It's probably illegal to discuss piano wire here...
Not to mention the things are not street legal here and they are the primary mode of transportation for those who wish to drink and drive. It seems unreasonable to me that 50 mph down my street is ok.
Laser pointers make brake lights come on. (or, so I hear)
Next moron on my property gets a firearm dischrged in his general direction.
Bad move: noisy (illegal within 500' of a structure in my area). Hunting slingshots are fun - mine keeps the deer away from my flowers, and I can target well enough almost to 50 yards. Does your state require a carry permit on your own property?
A slingshot hit to the chest should do it.
I have a slingshot. Never thought of that one.